Method for purifying high purity ammonium rhenate from liquid containing ammonium rhenate

Abstract

The invention relates to a method for purifying high purity ammonium rhenate from a liquid containing ammonium rhenate. The method comprises the following steps of: a, concentrating the liquid containing ammonium rhenate and adding a hydrogen dioxide liquid into the concentrated liquid; stirring and removing surface foam of the mixed liquid and filtering; b, cooling the filtrate obtained in the step a, then, filtering and taking out crystallized substances and performing centrifugal dewatering treatment, and placing the crystallized substances again to an oven to dry to prepare the high purity ammonium rhenate; and c, mixing the filtrate obtained by the step b with the liquid containing ammonium rhenate and repeating the step a and the step b to prepare a high purity ammonium rhenate product. According to the invention, the concentration temperature is reduced, the loss of rhenium entrained in vapor volatilization is reduced, and the rhenium recovery rate is improved. Compared with the prior art, the method is free from ammonia or ammonia water, and environment-friendly in the production process, and meanwhile, low valence metal ions which are difficult to remove are converted into high valence metal ions which are easy to remove by the hydrogen peroxide liquid. The low valence rhenate is converted into the high valence rhenate, so that the purity of the ammonium rhenate product is ensured.

Description

technical field [0001] The invention belongs to the field of ammonium rhenate purification in hydrometallurgy. Background technique [0002] The industrial purification of ammonium rhenate is to purify the ammonium rhenate solution by selecting appropriate methods, and then obtain high-purity ammonium rhenate through crystallization. The main methods are crystallization and ion exchange-crystallization. [0003] The crystallization method uses the principle that the solubility of ammonium rhenate becomes smaller when the temperature is lowered, so that ammonium rhenate crystallizes out from the solution and separates it from impurities. In the crystallization operation, the ammonium rhenate solution is generally concentrated to 1 / 3 to 1 / 4, and then cooled to a crystallization temperature below 273K. Under these conditions, ammonium rhenate crystallized out of the solution. Liquid-solid separation is carried out after the crystallization is completed. The resulting crystal...

AI Technical Summary

Problems solved by technology

However, the ion exchange-crystallization method prepares rhenic acid solution by ion exchange, and then reacts with ammonia water or ammonia gas to prepare ammonium rhenate, which increases the production cost. At the same time, the reaction liquid is alkaline, which is easy to cause environmental pollution.